GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting System Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the ON position.
  2. Turn the headlamp switch to the proper position.

Are both of the headlamps on?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Using a test lamp connected to a known good ground, backprobe the inoperative headlamp B+ feed circuit.

Does the test lamp turn on?

--

Go to Step 5

Go to Step 4

4

Repair a poor connection or an open in the inoperative headlamp B+ feed circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Has the repair been made?

--

Go to Step 8

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5

Using a test lamp, backprobe between the inoperative headlamp B+ feed circuit and the inoperative headlamp switched circuit .

Does the test lamp turn on?

--

Go to Step 6

Go to Step 7

6

Replace the inoperative headlamp.

Refer to Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement .

Has the repair been made?

--

Go to Step 8

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7

Repair a poor connection or an open in the left headlamp switched circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Has the repair been made?

--

Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

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Go to Diagnostic System Check - Lighting Systems

Go to Step 2